JP2008185206A - Flexible pipe joint structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a flexible pipe joint structure not causing damage of a pipe line and not causing leakage of water, gas or steam from a connected part due to corotation, when torsion is generated upon an earthquake or installation of a pipe. <P>SOLUTION: In a flexible pipe joint, a flexible pipe and a base joint are integrally formed, and a connecting member having a rotation function by combining and fitting an O-ring for preventing leakage and a retaining wire for preventing slipping-out to the base joint, is provided to each of ends of the flexible pipe. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a structure of a flexible pipe joint having a function of absorbing bending motion, vibration, and twisting in the axial direction and at a right angle to the shaft.

  Conventional flexible joints such as flexible joints and corrugated pipes have a function of absorbing bending motion and vibration in the axial direction and at right angles to the axis (Non-patent Document 1). Because it is integrated, the connecting member cannot have a rotation function, which causes damage to the pipe when an earthquake or twisting occurs during piping construction, or leakage of water, gas, or steam due to co-rotation from the connection point. It is easy to generate.

In addition, in order to solve such problems of conventional flexible pipes, pipe joints (Patent Document 1) having a function of absorbing torsion and expansion / contraction, and vibration resistance having a rotation function at both ends of the connection part are disclosed. There is also a tube (patent document 2).
The above-mentioned patent document 1 relates to a pipe joint having a function of absorbing torsion and expansion / contraction of a flexible pipe to which the pipe joint is connected, or a flexible pipe to which the joint is connected. Patent Document 2 relates to a vibration-proof pipe for a gas pipe having a function of bending a corrugated pipe to absorb back and forth shaking and twisting.
D) Movable pipe joint 4107 described in Non-Patent Document 1 The flexible metal hose absorbs bending motion, vibration, and the like, so that a pipe processed into a wavy shape and a fixed pipe joint are a pair. . Remarks Some types are bare and some are braided with metal.
JP 2003-287176 A JP 2006-125623 A JIS-B0151 Steel pipe fitting terms

  The conventional flexible joints and corrugated pipe joints described above have a function of absorbing bending motions and vibrations in the axial direction and at right angles to the shaft (Non-Patent Document 1). Since the connected pipes are integrated, the connecting member does not have a rotation function that absorbs torsion, which causes damage to the pipe line when an earthquake or twisting occurs during piping construction, Gas or steam leaks easily.

  In Patent Document 1, a pipe joint having a function of absorbing torsion and expansion / contraction is presented in order to solve such problems of the conventional flexible pipe. In order to give the pipe a function to absorb two-dimensional displacement and vibration such as right angle, it is necessary to connect a flexible pipe joint such as a conventional flexible joint or a corrugated pipe.

  In Patent Document 2, two-dimensional motion and twist can be absorbed by providing a corrugated tube as a device connecting tube for gas piping with a rotating function at the connecting portions at both ends, and performing bending piping.

  Although the problem of the pipe line using the flexible pipe joint such as the conventional flexible joint and the corrugated pipe can be solved with the piping structure of Patent Document 1, the number of connection points is increased and the work efficiency is deteriorated, and the cost is increased by increasing the number of pipe joints. Become.

  The piping structure of Patent Document 2 can solve the problems of conventional flexible joints and flexible pipe joints by providing a corrugated pipe with a rotation function at both ends of the connection and performing flexible piping. There are many parts and work efficiency is poor, which increases the cost of parts and construction.

  Therefore, in the present invention, in order to solve the above problems, the structure is simple, and a function of absorbing bending motion and vibration in the axial direction and right angle to the flexible tube such as a conventional flexible joint or a corrugated tube, and connecting members at both ends By having a rotatable function, it is possible to give the conduit a function of absorbing flexibility and torsion, and since it is connected as a single item, the workability is good and the cost is reduced.

  The structure of the flexible pipe joint of the present invention is such that the flexible pipe and the base joint are integrated, and the base joint is fitted with a combination of a leak-proof O-ring and a stop line as a slip-off prevention to provide a rotation function. The connection member is provided at both ends of the flexible tube.

  By providing a connecting member having a rotation function at both ends of the flexible pipe joint, it has a function of absorbing bending motion and vibration in the conventional axial direction and right angle (Non-Patent Document 1). It can have a function to absorb torsion that was not found in flexible pipe joints, so that when a three-dimensional movement occurs during earthquakes or piping construction, leakage from joints and packing due to co-rotation will not occur, Also, piping such as off-set piping and replacement of existing piping can be performed easily. Thereby, workability is good and a piping member with high earthquake resistance can be provided.

Hereinafter, an embodiment of a flexible pipe joint according to the present invention will be described with reference to the drawings.
As shown in FIG. 1, a straight portion of a stainless steel tube 1 is inserted into a stainless steel base joint 2, and an annular groove 6 is provided inside the base joint 2, and a seal material made of rubber or resin is provided therein. The O-ring 5 is inserted and the straight portion of the pipe 1 is expanded to integrate the pipe 1 and the base joint 2.

  In addition to the above, the method of integrating the base joint 2 includes a method of welding the end of the straight portion of the pipe 1 and the base joint 2, a method of caulking using a caulking ring by inserting the straight portion of the pipe 1 into the base joint 2, and There is a method in which a flexible tube, a blade, and a collar are welded and butt-welded to the portion.

  As shown in FIG. 1, the connecting joint 3 of the connecting member made of the CAC 406 and the base joint 2 integrated with the pipe 1 are fitted with an annular groove 7 inside the base joint 2 as shown in FIG. An annular groove 7 is processed so as to overlap the outer surface, and a retaining wire 4 made of a stainless steel spring material is inserted into the annular groove 7 to prevent it from coming off. An annular groove 8 having a depth that can be hermetically sealed is provided outside the joint, and a rubber O-ring 5 as a sealing material is inserted. As a result, the connecting member can have a rotating function.

  By providing the connecting member having the rotation function at both ends, piping such as replacement of an off-set piping or existing piping can be easily performed. Piping members with high earthquake resistance can be provided.

  In addition to the screw type shown in FIG. 1, there are flange type, mechanical type, and adhesive type connection joints for the connecting members.

  As a result, a base joint is provided at both ends of a flexible pipe such as a flexible joint or a corrugated pipe, and a connecting member is fitted to the base joint with a stop line and a sealing material interposed therebetween, thereby providing a rotation function. This is a flexible pipe joint that has a function of absorbing torsion in a bending motion and vibration absorbing function such as the axial direction and the right angle of the shaft. By using this pipe joint structure, it is possible to absorb the occurrence of water leakage and twisting of pipes due to the co-rotation of the connecting members, so that the building equipment piping such as water, gas and water supply, hot water supply, fire extinguishing equipment necessary for the lifeline It becomes a structure with high earthquake resistance.

Cross-sectional view of expansion-type connection member

1. Tube 2. Base joint 3. 3. connecting member 4. Stop line 5. O-ring 6. An annular groove for pipe expansion 7. Ring groove for stop wire Annular groove for sealing material

Claims (1)

  A flexible pipe and a base joint are integrated, and a connecting member having a rotation function by combining a base pipe joint with a leak-proof O-ring and a stop line as a slip-off prevention is provided at both ends of the flexible pipe. A structure of a flexible pipe joint characterized by the above.

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